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Finding the Fourth Proportional to 77,261.60, 115,746.60 and 72,012.80

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Solution

The fourth proportional to 77,261.60, 115,746.60 and 72,012.80 is: 107,883.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,261.60 : 115,746.60 = 72,012.80 : x
  2. Step 2: Convert to fraction form
    77,261.60/115,746.60 = 72,012.80/x
  3. Step 3: Cross multiply
    77,261.60x = 115,746.60 × 72,012.80
  4. Step 4: Simplify right side
    77,261.60x = 8,335,236,756.48
  5. Step 5: Solve for x
    x = 8,335,236,756.48/77,261.60
  6. Step 6: Final answer
    x = 107,883.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.